Adriana Fargo nervously bites her lip as she waits for news on the fate of her seven-year-old daughter, feared buried in the earthquake-hit remains of a Mexico City elementary and middle school.
At least 21 children died when a three story wing of the Enrique Rebsamen school collapsed after a 7.1 magnitude quake struck Mexico on Tuesday.
Thirty children are missing, and some could still be alive.
"No one can possibly imagine the pain I'm in right now," said Fargo, wrapped in a blanket as she sat with other anguished parents Wednesday in an improvised shelter near the school.
What is the girl’s name? Fargo's fists tighten and she stares at the ground, unable to pronounce her daughter's name. Her lips strain as she holds back what appears to be a mournful wail of pain.
One rescuer, speaking on condition of anonymity, told AFP that there were signs of survivors.
"It seems that some 20 children are safe with a teacher inside a classroom," the rescuer said, as he climbed down from the mountain of bricks, concrete and twisted metal.
He said there also appeared to be nine lifeless bodies in the debris.
Up to now, 11 children and at least one teacher were pulled alive from the rubble.
However, rescuers also pulled out 26 lifeless bodies -- all but five of them children, said rescue coordinator Jose Luis Vergara.
President Enrique Pena Nieto, who rushed to the site, warned that the death toll could rise.
At least 217 people were reported killed by the Tuesday quake.
- Picks, shovels and hands -
Fargo's husband joined the hundreds of soldiers, firefighters and rescuers clawing away at the debris since the quake struck.
Armed with picks, shovels and even their bare hands, the crew worked through the night in their desperate search for survivors.
"Silence, please!" a police officer barked through a megaphone. "Don't walk, don't breathe, we're trying to hear voices!" Any sign of life from under the rubble was welcome.
A stream of volunteers, many with lamps attached to their helmets, carried long wooden beams to prop up building sections that were in danger of collapsing.
Other volunteers formed a chain to hand baskets of bottled water to the rescuers. The baskets then returned filled with debris.
Maria del Pilar Marti, a teacher who works at the Enrique Rebsamen school, said that many children stayed in the building when the quake hit.
"We had to take cover in our classrooms until the quake ended," she told Televisa news. "Then we were covered in a cloud of dust when part of the building totally collapsed."
Tuesday's earthquake struck as the country was recovering from an 8.2 magnitude quake that hit on September 7 in southern Mexico, killing around 100 people and destroying homes.
In the aftermath Mexican authorities said they had inspected the country's schools, and verified that the structures were quake resistant.
The earthquake also hit on the anniversary of a massive 1985 quake that killed more than 10,000 people, an event that still haunts a country that has seen its share of disasters.
- 'It's chaos' -
Power outages, intermittent cell phone coverage and roads closed due to debris complicate the rescue.
In front of the school, two people sat at a table with a computer at an informal control center, keeping track of the children and teachers who died, those who were rescued and those still missing.
"It's chaos ... there are children that escaped the school but were injured, and are alone in hospitals without their parents," one of the people keeping track of the victims told AFP, speaking on condition of anonymity.
"Meanwhile here at school there are desperate parents that can't find their children."